Out-of-Bounds Write Vulnerability in Apple Products
CVE-2025-43300

8.8HIGH

Key Information:

Vendor: Apple
Status: Mac OS; iOS And iPad OS; iPad OS
Vendor: CVE Published:; 21 August 2025

Badges

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What is CVE-2025-43300?

CVE-2025-43300 is a serious security vulnerability impacting various Apple products, specifically related to an out-of-bounds write issue. This vulnerability allows attackers to manipulate memory areas beyond the intended bounds, potentially leading to memory corruption when a malicious image file is processed. Such exploitation can compromise system integrity, risk unauthorized access to sensitive data, and expose users to further malware threats. The affected platforms include macOS (specifically Sonoma and Ventura), iPadOS, and iOS, all of which serve essential functions for personal and enterprise users. Addressing this flaw is critical for organizations that utilize Apple technology, as attackers may leverage this vulnerability to conduct sophisticated and targeted attacks.

Potential Impact of CVE-2025-43300

Data Loss and Corruption: Exploitation of this vulnerability can lead to unpredictable behavior in affected applications, potentially resulting in the loss or corruption of important data, disrupting business operations and leading to costly recovery processes.
Unauthorized Access and System Compromise: Successful exploitation may grant attackers access to sensitive information and internal systems. This unauthorized access could facilitate further attacks, including data theft and the deployment of additional malicious software.
Targeted Sophisticated Attacks: The existence of this vulnerability has already been linked to advanced and targeted attacks against specific individuals. Such incidents not only threaten the immediate victims but also raise broader concerns regarding the security of entire organizations, especially if similar methods are used on a larger scale.

CISA has reported CVE-2025-43300

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2025-43300 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace as recent news articles suggest the vulnerability is being used by ransomware groups.

The CISA's recommendation is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.